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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e7dac28ec89dc698cc24b393a0e8e9d3aa46a379f9f54ba1f348fdd657a614' 
  AND token = '8nxHecHW/z5uXVqqeh7dUqXdXbszxVT5xTkiGLYsGJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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