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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca7a753b47364c68b506c04c4da32ae47dba6d0600b3e106b370e4a6988a0d6' 
  AND token = 'xV0omWF53zITUSmqGS4Rkh+RQ6+kE2MIT3N0mByVO3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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