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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d77d519503a0003c0c5935425fab34ae5ac823333f66febcfce5d8a7a5529f' 
  AND token = 'HfO3CvdLwn0gL38aU9gki17q7DYPvtzhaBh7a6WRkr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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