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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baad6ec4c0c90e0539e4cb50ddaa165ee1610d854b3b6f2244e79c6eb7b4cb71' 
  AND token = 'H7LZRvy3XOZ7CmmAevWrjfdO1Bu+wPwJ9e52e5xPiD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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