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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83e2de5c8b58a0e61217b9250f9ba5dd2ebd5f35c42d8b0137b89a1df006bea' 
  AND token = 'uc0InWrt0JETJFlHefeCYDxlisSrOD2257SiZQ7v/Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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