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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c00adb334bdb303e3c8a0e53041a98422c758318dd18a05eec47ff56e67a81b' 
  AND token = '08e7eu2QqZ1M9ohY/SKQGupy9XEBQKAo+T9M3C+Y3Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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