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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10959532b9273846abb14585f66dceec086b21cf2bb60ac245526f10a65b2d7c' 
  AND token = 'it0mXTL6tq2fC32Gx5QXXAQf0Gu0w9RCxUq5umUwJkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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