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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c95e21036a45c0836ae4be6fe2d3ebd7b70fbe4717beb5384a6747d71db9243' 
  AND token = 'WBuekJ/AUmHUK6fxPLXyWutBrg0tYFvrUD647z4vW4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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