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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e882777ba81a2d1d5a7eb4402997f9a45e10a9af8203955cfc285a6f28bcb2' 
  AND token = '+vwNIh3yc14jgbq4BozC3e89hOJ2Dncn3ZHUXFx1MYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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