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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8beabf1fc06632875b0cbf7a5e6258083bfad126aee2fd13d7a9d424ac2bb8d0' 
  AND token = 'eQG24hzu64JtfYSVDXZ/m4mSO7I8o7PHO+ohWd1WQmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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