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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4057ce7f6d3221fb797f5c7f33e917a8aafb0e5264706c4d3fbe6383f9923172' 
  AND token = 'l0kv5mi1/Sy3tII6X1t+TmSonMkc9L84AODq+ruTvLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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