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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ecee8bcad1bb862c5cbae09918653e041cf79aa2e5fef0fd0c296d3b48d9f9' 
  AND token = 'nQ8dwpETO8RLrHQLchDobrb6lq7cKGa8KXeS7Gdt6w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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