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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1278da404d01be06ecd7a040b0a68d2d2f2d328859e5851ad943f468e61df3c9' 
  AND token = 'gFHcFhubBxYJmR4aRkZbKjQxSQKfUtcMl086kI8jr1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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