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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ba0859732bbe7ebd7850cdfd74e8b7d29b7c927a3e608c4ec865888ae9bfac' 
  AND token = 'qj98CJ3JjA/UVuazXZC7hDYQ325E2I9mmqKPP2hnBmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}