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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f8b8f6dd439fd9c0954a98feaa394293f57867845115311788507cd9d50994' 
  AND token = 'arlFGZPHvKq01JN+xGsWMkk3IMonKD2rpJ3rlmvtTCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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