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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770593247dc93cdf62fa9b25c4378962f1f959d6db9b7097431476ca10ac3282' 
  AND token = 'xPVLL9lARfv5c+R+FkY5voitlVZflK/cb29g1vP/4TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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