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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c73134ff317b1b3a8dcf020e589076b0c204c2b42652dcd467b5b12e688111b' 
  AND token = 'XooORasb/k0ZzylQ64wdueRqOQyop1Zckt4yBpR4+aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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