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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3078d0631297831f74bb170827a7a6f0a2568956fec4f39fb53e47242b624b2a' 
  AND token = 'HyDE3fxWF/ML5M3tL2P05gJ5Eo/HYd9a1ltdq0zXEZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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