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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3a16c2701655afbda2c9b5bcaff7fd3a70b44eea8dfc5dda0a7dffeb48d6d7' 
  AND token = 'XGFd00kyVLvdeVksySzYB4AiWHXkMHX2VvPQCODdvYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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