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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e54a86e20cc4fe7a36c5aedf98c4d03ce36fd71be35a64ed9588ef881e9777c' 
  AND token = 'JF6pVUhendNG+OgtWQBTqngU2759AUIT+O78fJi6dVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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