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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307894d4a0ee249919d68dc14b4e3e83a51274e195da481acf0ed6a183b4b11d' 
  AND token = 'ODdbK95b+XB7aMaknpzYkjzsVHG2neFw7tECnk32Nh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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