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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5663d47fa325500acca7242e6c1164181b4f1aaf51ee7a02c365608899a32f' 
  AND token = 'DGt7CcyFXfqJ8N8VZr20VOWCuMv8XIT62GzfZeBvqWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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