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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc482b565d2df6ed8298a5fbe59116bd1329756b6589bef188f1c14c727b6288' 
  AND token = 'WGtMi2H/dEfEs0GIx+XBOsAu8NxanAbaO6b1ySpxhgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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