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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd05bcae4a7641504e893de66b4df16dbb440df1eda4029e5d3e7c63a8b4436' 
  AND token = 'DeoS/4OUczn3AckUMaEsQ1BM+dBLN3OlIKKDrw3f+pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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