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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b8a99a6fa01140ddf3e920e6a11c00fa6cc5fbaebfa56faa09c32d5eda24f5' 
  AND token = '7NwcRc9+iP9nFwBA12nB0GVHZjaiv+CF0OLTlO4wakg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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