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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d5837736b0e926557b5e69442f06754e3db726e32f51d2cbb5f87ff0ca403a' 
  AND token = '8E7K9pGaI0/mfqwFiPfBS5Ui3KgXGCMShLdiwQmXCCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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