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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995d5e60ae115738acca9d80e55890d90dcc28541a92250b4f0a2c3b8dc1b2b5' 
  AND token = 'prQ6z0mLVIpWB72SKJ7J5aDmn/tnqnqW9yjcc7gn5N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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