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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0830e0a20161fec69da1ba9c93cb7d4de8c0e691f38d874c74e6730a90b6265' 
  AND token = 'j+kNEPpeeYLKu0CkA7LjVr12jEQHi/1GaGyXv1esAG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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