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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd610adc54922be71062ae406e2b2d20e029a2e1170ae35b7f886d56e586e2e8f' 
  AND token = 'kVWg3vbW+CqWFHCxO8r1K5NlIhRk5zJ/0e8Yt7tYzWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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