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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7a7cb4957a91a4caf159a084e01617cdb2ab99298adb12ef9eacdad72b21df' 
  AND token = 'b5Px0azWiYUsmFNuYzFh8t/eL4l44X8LO5aNNueNcvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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