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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a490d9a65eae50c447edef839addee2a9ef81d7150c5ab4af2a312f46f0ffa08' 
  AND token = 'bTEx1Ld08g741yof/n9mQhn3rGH6yX7Sh1lnm1zeKXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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