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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ed50cd5891fb55cbe4fa14ac60ba09ddeae4714966a01a67afec8604ba5cd5' 
  AND token = 'QNaOLK5mwvFlxo8OmJvYMid8piO8AkqC73XF+E+1P50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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