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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94f8886f32a5f9efec9fc3ae15312897754237fec9ad1f1d1f1c12e9e20b975' 
  AND token = 'Jnt/GKwsUtQRHFriT9TdMTW/Bk4dXYD7suGYA/RUID8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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