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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b778fa3b4dae4130059b769ecfa9137df57efb31398019b02abed3c3e992f736' 
  AND token = 'LHnKH+0FjoIqZ+TaM6Jf+MkJIbZNOYFo/WxgcWgCEt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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