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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9247572560a0fe55a07492a2179ac9a933c128fbd84435a615e0d57c737aae4c' 
  AND token = 'Jph87qqQ7tj7WHk+zyczQL+MEzmwPT6I3a0o5annFHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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