SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7067a58cb9156d2c4819db23bae981643e2f71e023a430f39e55f5dfc06d6b21' 
  AND token = 'Jurz/CzpNKRSTbKR6YPXaOglIHqzaEC2n8Dw3+wabko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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