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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967264386f8fbffe70f80c2c055dc0e3631b03f25b0c4443325b9bf9f2c5b88f' 
  AND token = 'MxU36yQCnQ6cVnlDyzz1mSNRfL8yup/lDRvAaw2Ltkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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