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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c514bd0e2c61e47f1a9e4db432d4428bfc9bea8151f5e3b4010b834ff31a5ce' 
  AND token = 'tTn5q9724RIVQKQ374BjgzwNnSRfklv5LNEUTDPaQZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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