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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9bd5c95667233cfacd5e447e0453158068ab08a1c9ca625c5cca3a63fc3837' 
  AND token = 'unh21H+ucHloFRTo+juDQ05+TzxsGddl2Go9BmK2Ayw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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