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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a538d7702314cf773b884d2723e6907aed7db877bfeb12e674cf3024bfb47b85' 
  AND token = '9CRc7X873sMrbceGAtzkofxabDmverRS9LLMZDKMa8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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