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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08364a70b5a6a24f7da53b0b45ebeda9c218d090824388ecc4b2a6d20b3f6811' 
  AND token = '5gnfyb4A3lI1QBQLxhWkrtwU8/a4574qLXaRji7Y1rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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