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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae62650bbd5801c4debf29a1fa123c536c043ed346dee067944b71af92992ea3' 
  AND token = 'wNBdEmAkEJu7ECoBlFyoLJfUYLmOnWDic2Mwso3i5bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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