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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace0e25be88b6a56e504ceb6d34f408afe82f15c5617d9b379da171ac60af6d6' 
  AND token = 'Gjxyqup0usHbw5c/XGcH7Z9/M8riUdQ7/XSlwOYt2kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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