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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad77b92603dbbecfa2c9af3bed32a60cf170cabe2631b9be302d6993d5281c9a' 
  AND token = 'knq0dMdSLUmRjp3NcOBNogWmnocZXuxiSpns6rdpxn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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