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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b870aaf03075dfc1f84c5d65366ac581735e6a66a43762a79a6d04fd6d797e7' 
  AND token = '+T6TE6kzTU6nKmBR7/lYxCai0kC2wAaQ/+TkEHvxr8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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