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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053a703109231f86de9bfab0e1c58ca4172d586c8aff5c2742d00f89d307f7d3' 
  AND token = 'RrKaAEqEe3YsTLj1uOIDbhP/yqY5q5uEMYEM2nmxYqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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