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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fe8d591125f53470416de405a87522c7b94debd34549d9969133a85f5688c1' 
  AND token = 'Q9zdVG6jrgU8rf/rfyYPH5pNEWX3a7WdzWz9xwGV/4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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