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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a138d1dbd65a2cd5db4cd2d9f2b8e495f8f0f78089eb0a690f2e3512a4b9c8ad' 
  AND token = 'NVhv2q44MDHORaSn+28rOKMstExft1NW0EOiCxVSfx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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