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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd457a484302a3965500d525cd5dbdd7b4c676073a86348a2f37abd028585c4' 
  AND token = 'hRT6itfv0kxmXId6INpJuyuqk24aGDHd/r085e1nnew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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