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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd178f5d6d1a429ef8943eca2244e0ab09b3cce2720f08d270bc98ff91a5776' 
  AND token = 'hNGu3MSX81Yf9p7z18f+jB/W4Qeidtqju3ftgcIxS0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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