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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1775e3acc771c636aa572738f81e27b1533434c2304d18b7f08d314f0e73024' 
  AND token = 'Ca+ZowY2lTMYEUuIM0WtZtmeouO9AAPMml8Jf1rvsnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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