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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc679bcd54deb98082f09f1b92f4d028295a86e3db34f8a501a450e869adb40a' 
  AND token = '+JatmWRTdppmmigH90Q0/n7mSRRifPh46D5TkheK01g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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