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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da87355b5922ba52654d975766d5ae1d8194802624b8799d59bc070b4686114' 
  AND token = 'hENrtlW4ADD9dzVZMknzciEPZJbXQ1DCTdBIRkHgd6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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