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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4ffd4df107bc4b2c816c5df0f7f892800b0772f1d008d55ef021343fbed15f' 
  AND token = 'ebW8Imv97lWkliwL6NfpphNvziP7eL7y1UMxweG1dL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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