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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4839c95a6cdc35633cd3f4d17d4c0f02f1ba5d1ec7b975df6a194dbb98eecd' 
  AND token = 'T5S/AsB5hQIsqC5R7sSQN8QGL/cp3IhAgTbZyFAYG/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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