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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd458ebece035d3a0c63fd17361d9275662706b5510e61aae1809de407e0d4410' 
  AND token = 'jYG1pFT2dfTT5YCkN0rchT0XnApUv3f142D0MYCE7P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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