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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f50c6eaf704738463efa32981269bc90d85cafda33ff7cbdd1b00ffdfef0122' 
  AND token = 'sriKlfoeHtk/kfVIfp+J7hn7bLt6tMAzPvZJweOvZns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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