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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb45a21f9124593853bb191b68417ab96c566cefc9b247058be910fded40d18' 
  AND token = 'RoM/Px37gGSkVm7b2wOmwP0+GzRzX80kDIC5iezFHQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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