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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ada07cc9a271f1742495614a26b7ac670558edf86ad2654462d27a82ca24f9f' 
  AND token = '1NNr2wiae4KSh9AwJbt3UItWjUziwFoZ0bP9kE5Nck4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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