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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986295df4196b8d0423781acd0ff6c1d2ecf9e6aa5cbcf2dbd01ecbbb8724694' 
  AND token = 'G3LFUklC7+YoRjPjiPpYc1NMlvTxFukyEmkIO6hJkkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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