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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4f3940e2da352777e1c34de2e22653527000ef9cac40e75ea0eb1ba37bcdb1' 
  AND token = 'wdPuL8xNzpVQA0fzuqMZ8wcgMZVsEUv5iSfW6fkK4G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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