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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb81c30bba8caa9c50f276bde4eeb77a6779dad8b76acee0d5195dc0fc7e690' 
  AND token = 'zLQMYdR+9iBrmqnwIZUqI53HR7Cx2KruxNd44Jx+/J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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