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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd108afac4066884ec841ca2db17f2b537d9d8c1e810532f2c5874779faa04a95' 
  AND token = 'bacXFjRSkIQXwyUmoLFn8OY0QvHUlmRAbHULsVvqu7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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