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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3f62058f7c3bb196d27a7c9ca7b5ab693225f0341c9d0917c56873083cffe7' 
  AND token = '7+zYDxztHu+VimWLHrLeOW0X9SKff699pYkMxx/8UyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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